The MTT MS3702B is a slim plug-in RTD temperature transmitter, mounted on a plug-in base socket for quick swap-out without rewiring. It accepts Pt100Ω, JPt100Ω, or Pt50Ω inputs, covering -200 to +850°C (Pt100Ω), -200 to +500°C (JPt100Ω), or -200 to +600°C (Pt50Ω), with minimum input span of 30-50°C (Pt100Ω/JPt100Ω) or 60-100°C (Pt50Ω). Excitation current is approximately 1mA for Pt type at 0-100°C, with lead wire resistance up to 200Ω max per wire.
Output is 0~20mA DC, 4~20mA DC, or DC voltage ranges from 0~10mV up to ±10V, available as a single output or an isolated dual output, with 4-way isolation between input, output 1, output 2, power, and ground. If the sensor wire opens, burnout protection drives the output upscale as standard.
Accuracy is better than ±0.15% of span (at 25°C±5°C), with temperature effect better than ±1.0% of span per 10°C ambient change and response time of 240ms max (0-90%). CMRR is 100dB minimum, with insulation resistance of 100MΩ minimum at 500V DC and dielectric strength of 2000V AC for one minute.
The unit mounts on wall or DIN rail via a plug-in socket base, with M3.5 screw terminals, weighing up to 120g for the main unit and 80g for the socket, with overall dimensions of 29mm × 86mm × 125mm. Power supply is flexible: 100-240V AC (47-63Hz), 24V DC ±10%, or 100-240V DC.
| Input Types | Pt 100Ω, JPt 100Ω, or Pt 50Ω |
| Temperature Range | -200 to +850°C (Pt 100Ω); -200 to +500°C (JPt 100Ω); -200 to +600°C (Pt 50Ω) |
| Minimum Input Span | 30-50°C (Pt 100Ω/JPt 100Ω); 60-100°C (Pt 50Ω) |
| Excitation Current | Approximately 1mA for Pt type at 0-100°C |
| Lead Wire Resistance | 200Ω maximum per wire |
| Output | 0-20mA DC, 4-20mA DC, or DC voltage ranges from 0-10mV up to ±10V (single or isolated dual output) |
| Isolation | 4-way isolation between input, Output 1, Output 2, power, and ground |
| Power Supply | 100-240V AC (47-63Hz), 24V DC ±10%, or 100-240V DC |
| Accuracy | Better than ±0.15% of span (at 25°C±5°C) |
| Temperature Effect | Better than ±1.0% of span per 10°C ambient change |
| Response Time | 240ms maximum (0-90%) |
| CMRR | Minimum 100dB |
| Insulation Resistance | 100MΩ minimum at 500V DC |
| Dielectric Strength | 2000V AC for one minute |
| Sensor Burnout Protection | Upscale, standard |
| Dimensions (W x H x D) | 29mm x 86mm x 125mm |
| Weight | Main unit up to 120g; socket up to 80g |
| Mounting | Wall or DIN rail mounting, plug-in socket base |
| Terminals | M3.5 screw terminals |
| Operating Temperature | -5 to 55°C ambient (storage: -10 to 60°C) |
| Operating Humidity | 5-90% RH, non-condensing |
Frequently Asked Questions
What is the MTT MS3702B used for?
It converts a Pt100, JPt100, or Pt50 RTD temperature signal into a standard 4-20mA, 0-20mA, or DC voltage output, built to stay accurate even on a narrow process temperature band.
Can the MS3702B be used for a wide temperature range instead?
It can, but it’s specifically built to hold accuracy on narrow spans (as tight as 30-50°C). If your process covers a wide temperature range, the standard MS3702 is usually the better fit — tell us your process range and we’ll confirm.
What’s the difference between the MS3702B and the standard MS3702?
Both are RTD transmitters, but the MS3702B is tuned to hold accuracy on a narrow measurement span, while the standard MS3702 has a tighter temperature-effect spec for general-purpose wider-range use. Which one is right depends on how narrow your actual process band is.
What’s the difference between the MS3702B and the MS3702-01?
The MS3702-01 is built for 4-wire RTD sensors, which removes lead wire resistance error on long cable runs. The MS3702B is a standard 2/3-wire unit tuned for narrow-span accuracy. Match the model to your wiring type and process range.
How do I know which MS3702 model I need?
Tell us your RTD wiring type (2, 3, or 4-wire), the actual temperature band your process runs in, and the output signal your PLC or DCS expects. We’ll confirm the right model before you order.
Download MTT MS3702B Slim Plug-In RTD Temperature Transmitter information here
Spec Sheet: MTT MS3702B Spec Sheet
Manual: MTT MS3702B Manual
